視圖模型在LINQ

Question

返回數據的名單我有一個包含訂閱

public class ProjectViewModel 
{ 
    public String ProjectId { get; set; } 

    public String Name { get; set; } 

    public List<Subscriptions> Subscriptions { get; set; } 

} 

public class Subscriptions 
{ 
    public long Id { get; set; } 

    [MaxLength(40)] 
    public string ProjectId { get; set; } 

    public string SubscriptionId { get; set; } 
} 

現在我想收集視圖模型數據的正常性和列表的組合視圖模型。我將從數據庫上下文收集哪些內容，但是如何收集訂閱列表的數據？

var result = (from p in DataContext.Project join c in DataContext.Subscriptions 
         on p.ProjectId equals c.ProjectId 
         select new ProjectViewModel { ProjectId = p.ProjectId, 
                Name = p.Name 
// List of subscriptions ? 

Answer 1

你可以做一個group join：

var query=from p in DataContext.Project 
      join c in DataContext.Subscriptions on p.ProjectId equals c.ProjectId into subs 
      select new ProjectViewModel { 
             ProjectId = p.ProjectId, 
             Name = p.Name, 
             Subscriptions=subs.ToList() 
             }; 

但是打算，如果你使用navigation properties來構建查詢要簡單一些：

var query=from p in DataContext.Project 
      select new ProjectViewModel { 
             ProjectId = p.ProjectId, 
             Name = p.Name, 
             Subscriptions=p.Subscriptions.ToList() 
             };